Arcesilaus (; Greek: Ἀρκεσίλαος; 316/5–241/0 BC) was a Greek philosopher and founder of the Second or Middle Academy—the phase of Academic scepticism. Arcesilaus succeeded Crates as the sixth head (scholarch) of the Academy c. 264 BC. He did not preserve his thoughts in writing, so his opinions can only be gleaned second-hand from what is preserved by later writers. He was the first Academic to adopt a position of philosophical scepticism, that is, he doubted the ability of the senses to discover truth about the world, although he may have continued to believe in the existence of truth itself. This brought in the sceptical phase of the Academy. His chief opponents were the Stoics and their dogma of katalepsis (i.e., that reality could be comprehended with certainty).